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<blockquote data-quote="shredder1" data-source="post: 8913473" data-attributes="member: 658920">Don&#039;t get caught up in minutiae would be my advice. I&#039;d take a look at the port area^ft3 myself. You claim its 7.5ft3 ok... it sure doesn&#039;t look like it to me... that said with 3 ea 6&quot; rounds that&#039;ll be what? 78in2 of port which in 7.5ft3 comes out to 10.4in2^ft3 and that&#039;s low port area in my experience. Especially with the power you have.Edit*** I&#039;m just saying somethings off about the whole thing. Your either presently tuned too low with those Dreamsicle 15s or lack of port and tuned too low once the DB are back in. Having to hard clip those 4515&#039;s and slag the coils to even get close to 150db kind of smells like compression to me. I would think with a single 8K on 2 15&#039;s it should do the job or at least get you close.I tried to model those Dreamsicle subs up and did not like how they looked due to some parameter values being off. I reentered everything and substituted some known values for what seemed off and... voila&#039;3 6&quot; will be enough port for the current subs you have if the subsonic is set right. That low tuning is certainly killing output. I&#039;d wager with the 4515s in there and both amps hooked up no matter what the output will compress and you&#039;ll reach thermal limits pretty quickly.In my experience a set of hi power 15&#039;s with the power your putting to those DB subs usually want 120in2-130in2 of port in&nbsp; 6.5ft3-7.5ft3 for a slot. 2 8k&#039;s... oh boy... thats some juice for sure.</blockquote>

[QUOTE="shredder1, post: 8913473, member: 658920"] Don't get caught up in minutiae would be my advice. I'd take a look at the port area^ft3 myself. You claim its 7.5ft3 ok... it sure doesn't look like it to me... that said with 3 ea 6" rounds that'll be what? 78in2 of port which in 7.5ft3 comes out to 10.4in2^ft3 and that's low port area in my experience. Especially with the power you have. Edit*** I'm just saying somethings off about the whole thing. Your either presently tuned too low with those Dreamsicle 15s or lack of port and tuned too low once the DB are back in. Having to hard clip those 4515's and slag the coils to even get close to 150db kind of smells like compression to me. I would think with a single 8K on 2 15's it should do the job or at least get you close. I tried to model those Dreamsicle subs up and did not like how they looked due to some parameter values being off. I reentered everything and substituted some known values for what seemed off and... voila' 3 6" will be enough port for the current subs you have if the subsonic is set right. That low tuning is certainly killing output. I'd wager with the 4515s in there and both amps hooked up no matter what the output will compress and you'll reach thermal limits pretty quickly. In my experience a set of hi power 15's with the power your putting to those DB subs usually want 120in2-130in2 of port in 6.5ft3-7.5ft3 for a slot. 2 8k's... oh boy... thats some juice for sure. [/QUOTE]

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